3mm Perwanger water resistant rough cut leather.Tri.aria Membrane System - Durable waterproof and breathable membrane.Anatom Comfort Last - Anatomically designed last for premium fit around the whole foot.Vibram® Winkler Outsole with EVA midsole for cushioning & lightnessFully stiffened mid-sole produced from calibrated nylon.Full Rubber Rand - For added protection around the whole base of the foot.Speed Lacing with a double lock-off system for increased flexibility and fit of the boot.The boot is compatible with a C1 or C2 crampon.